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We show experimentally that thermal lensing largely determines the lateral mode properties of broad-area lasers. However, additional broadening is observed at high powers, which will limit how effectively mode-filtering techniques can improve beam quality.
The spectral width of high power DFB-BA lasers is shown to be limited at low powers (1–4W) by higher order vertical modes and at high powers (4–11W) by increasing numbers of thermally guided lateral modes.
For maximum fiber-coupled power, broad-area (BA) diode lasers must operate with small lateral far field angles. However, these structures are laterally multi-moded, with low beam quality and wide emission angles. We use a combination of device simulation and diagnostic measurements to determine the physical factors limiting the lateral far field angle in state of the art BA lasers emitting at 975...
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